Abstract: Tanker relies on manholes for ventilation, which easily accidents. A method of arranging two ventilation pipes on the inner surface of the tank to form "one suction and one delivery" to realize the ventilation cycle is proposed. According to the piping method, it is divided into ventilation scheme 1 and scheme 2. The simulation of different ventilation schemes shows that the natural ventilation method only has gas flow at the manhole, which is low in safety. Scheme 1 and scheme 2 form a better air circulation in the tank and can achieve ventilation. Scheme 1 uses a pipe with diameter of 150 mm for ventilation, and the distribution of wind speed in the tank is relatively stable. The average wind speed is 0.778 m/s, and the ventilation effect is good. It is 0.675 m/s, the speed fluctuation is small, and the safety level is high.

Key words: mobile tanker, ventilation, numerical simulation